I'd love to see a decentralized version of this - VR instances run on individual or group-owned servers that perform the bulk of the environmental simulation and rendering for clients, and have some sort of intercommunication protocol. Once we have high-res environments and fluid UIs to use them, I really want to create my own virtual space, share it, and experience others' spaces, I just don't necessarily want Faceb…
For a sampling of some of the worlds people have built, check out https://vesta.janusvr.com/